client: add a block blacklist extension (#4544)

* client: add a block blacklist extension

* test-utils: fix client construction

* client: fix rustdoc test

substrate/bin/node/cli/res/flaming-fir.json

@@ -22,7 +22,8 @@
     "tokenDecimals": 15,
     "tokenSymbol": "FIR"
   },
-  "fork_blocks": null,
+  "forkBlocks": null,
+  "badBlocks": null,
   "consensusEngine": null,
   "genesis": {
     "raw": {
@@ -119,4 +120,4 @@
       "children": {}
     }
   }
-}
+}

substrate/bin/node/cli/src/chain_spec.rs

@@ -47,9 +47,12 @@ const STAGING_TELEMETRY_URL: &str = "wss://telemetry.polkadot.io/submit/";
 /// Additional parameters for some Substrate core modules,
 /// customizable from the chain spec.
 #[derive(Default, Clone, Serialize, Deserialize, ChainSpecExtension)]
+#[serde(rename_all = "camelCase")]
 pub struct Extensions {
 	/// Block numbers with known hashes.
 	pub fork_blocks: sc_client::ForkBlocks<Block>,
+	/// Known bad block hashes.
+	pub bad_blocks: sc_client::BadBlocks<Block>,
 }
 
 /// Specialized `ChainSpec`.